EVALUATION OF PLANT PRODUCTS FOR THE MANAGEMENT OF DIAMONDBACK MOTH, Plutella xylostella Linnaeus ON CABBAGE
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Date
2000
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University of Agricultural Science, Dharwad
Abstract
"Investigations were undertal<en to evaluate the multiferous effect of ten
indigenous plant products and two commercial plant products (Honge oil and
neemark) against diamondback moth (DBM), Plutella xylostella Linnaeus.
Under laboratory conditions, aqueous extract of Azadirachta indica
(7.5%) recorded maximum egg hatch inhibition of 60.02 per cent and also
showed highest ovipositional repellent property with 75.00 and 83.55 per cent
reduction in egg laying under no choice and free choice conditions, respectively
at 24 h. Similarly, in methanolic extracts also A. indica (0.5%) exhibited
highest ovicidal activity with 47.91 per cent egg mortality and recorded
maximum reduction in egg laying of 50.33 and 62.43 per cent at 24 h under no
choice and free choice conditions, respectively.
Aqueous extract of A. indica (7.5%) caused highest larval mortality of
76.67 per cent followed by honge oil (0.4%) with 66.67 per cent mortality at
72 h. A maximum of 46.67 per cent larval mortality was observed with
methanolic extract of A. indica (0.5%) at 72 h. Among aqueous extracts, both
7.5 and 5.0 per cent concentrations of A. indica showed highest antifeedant
property with 3.92 and 5.68 per cent leaf feeding at 24 h, similar with the case
of methanolic extract (6.32% leaf feeding) also.
Three promising plant products viz., A. indica (7.5%), honge oil (0.4%)
and Acorus calamus (7.5%) based on their laboratory performance were
selected and evaluated along with new chemicals (Carina and Roket) against
DBM on cabbage under field conditions. Four applications of A. indica was
equally effective as that of new chemicals by recording cent per cent reduction
in larval population over control after three days of fourth spray. It recorded a
yield of 31.86 t per ha, being next to the new chemicals tested. Malathion
(0.1%), a recommended insecticide failed to protect the crop with lowest
reduction (54.03%) in larval population and also recorded lowest yield
(18.70 t/ha). The highest B : C ratio of 50.96 was noticed in honge oil
followed by A. calamus (35.05)."
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No. of references 136